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• P0456

  P0456

  
  

  Diagnosis information - DME V6 DFI Tank system leak

  Diagnostic conditions

• Short tank leakage test + short test tank vent valve within one engine operating period
  
  
  or:
• Vehicle voltage 9 V ... 16 V
• Ambient air pressure > 730 hpa (below approx.2400... 2700 m above sea level)
• The engine must have cooled down by at least 42 °C (76 °F) between when it was last switched off and restarted
• Engine temperature > 5 °C (41 °F)
• Intake air temperature > 5 °C (41 °F)
• Fluctuations in the intake air temperature of less than 12 °C (21 °F)
• Drive with long partial load portion
• Vehicle speed 3 ... 150 km/h (2... 93 mph)
  
  

  Possible fault causes

• Vacuum system leaking
  --> The system consists of the mechanical vacuum pump (on the vehicle engine), the brake booster, etc., the leakage diagnosis pump, the intake pipe switch-over valve and, where appropriate, the exhaust flaps in
  the rear muffler
• Vacuum pump faulty
• Tank cap not closed correctly or faulty
• Tank vent has mechanical fault (does not close completely)
• Internal (diaphragm) or external leak in leakage diagnosis pump
• Tank system (incl. hoses) leaking